I-eat-absorbing plate for cooling-coils



(No Model.)

A. CAMPBELL.

HEAT ABSURBLNG PLATE FOR COOLING COILS.

Patented Mar, 12

q/vi/twewaa,

Warren Sraras Parent other.

ALLAN CAMPBELL, OF CHICAGO, ILLINOIS.

HEAT-'ABSORBING PLATE FOR COOLING-COILS.

5PECIFICATION forming part of Letters Patent No. 399,493, dated March 12, 1889.

Application filed December 3, 1888. Serial No. 292,552. No model.)

To all whom it may concern.-

Be it known that 'I, ALLAN CAMPBELL, a citizen of the United States, residing at Chicago, in the county of Cook, State of Illinois, have invented certain new and useful Improve ments in Heat-Absorbing Plates for Cooling- Coils, of which the following is a description.

My invention relates to a system of artificial refrigeration by means of a coil or series f pipes which extend through a room or space to be cooled and serve to conduct any suitable refrigerant, either liquid or gaseous, which absorbs and carries off the heat from the atmosphcre surrounding the pipes. Its objects are to increase the. heat-absorbing metallic surface exposed to the atmosphere and to so unit or connect all the lengths of the pipe or adjacent sections of the conducting-coils that lateral displacement of any number less than all of the pipes is impossible.

It consists of a metallic plate slotted to embrace two or more of the pip'es,'holding them at a ti xed distance apart and presenting a large surface to the surrounding air, from.

which the heat is absorbed and transmitted to the refrigerant in the pipes; and it further consists in such application of these plates to the pipes as to thoroughly interlock or tie them to one another.

In the accompanying drawings my invention is shown in the best forms now known to me; but certain obvious changes in the construction of the plates or the mode of applying them to the pipes might be made by any skilled mechanic without departing from the spirit of my invention as set forth in the claims at the end of the specification.

Figure 1 is a side elevation of one of my plates, showing the form I now prefer. Fig. 2 is a vertical cross-section of the same on the line 2 2 of Fig. 1. Figs. 3, 4, and 5 illustrate some of the modifications that may be made in the form of my surface-plates. Fig. 6 shows the preferred manner of applying the plates to the series of pipes.

The pipes A of the cooling-coil may be arranged about the room to be cooled in any desired manner; but I prefer to support them by hangers suspended from the ceiling in the well-known manner now generally practiced.

The cooling material, which may be ammonia or analogous gas expanded directly into the pipes, or any suitable saline solution at a low temperature, is forced. through the pipes, which constantly extract or absorb the heat from the surrounding atmosphere and transmit it to the cooling agent, by which it is absorbed and carried 01?.

As is well known, metal is a good conductor 'of heat, while air is' a very poor one, so that the metal pipes extract the heat from such air only as comesinto actual contact withor in very close proximity to them, the cold air falling and the warmer 'air taking its place by a slow process of natural circulation. Now the pipes are capable of transmitting to the cooling medium within them a much larger.

amount of heat than that contained in the comparatively small quantity of air that comes within the zone of their influence, so that the etfectiveness of the cooling medium for any given length of the pipe traversed by it is not fully developed. In order, therefore, to secure the best results from the flow of the cooling medium, I must increase the efliciency of the pipe as an absorber of heat, and this I accomplish by means of the thin metal plates shown in the drawings. These plates embrace and rest upon the pipes and greatly enlarge the metallic absorbing-surfaces presented to the air, while their high conductivity and metallic contact with the pipes enable them to extract heat from the air at points outside of the effective zones themselves.

The use of absorbing-plates to increase the efficiency of cooling-pipes is not in itself new, for metal disks have been used before this time, and I do not claim this idea as a feature of my invention, which consists in the manner of forming the plates so that they may readily and easily-be applied to the pipes, two or more of which are embraced by each plate and securely held against lateral displacement.

In the drawings the plate B (shown in Figs. 1 and 2) is slotted from its bottom edge to embrace two ot the pipes A, upon which it rests, and has flanges b projecting from each side and resting upon the pipes, serving to increase the metallic contact with the pipes, and also acting as a base-or saddle to prevent the plates from rolling off sidewise.

these figures, being provided with plugs which In Fig. 3 I show a plate, C, slot-ted from the I bottom edge to embrace the pipe, the slot increasing in width from the edge to the center and adapted to receive a correspondinglyshaped plug or block, 0, which may be fitted g to drive tightly and be held in place by frictional contact only; or it may be secured in any other suitable manner.

Fig. 4 shows a plate, D, having a slot tapering in the opposite direction to that shown in Fig. 3 and fitted with a correspondingly- I shaped plug, (1, which may be driven home and held in place by friction; or it may be i provided with one or more ears, (1', and bolted to the plate, as shown. The plates shown in I complete con-tact with all sides of the pipes, may be made with or without the ledges or saddle b, as preferred.

In Fig. 5 I show a plate, 1, slotted from its end to fitupon the pipe.

Fig.6 is a perspective view of several pipes with the several forms of plates before referred to applied thereto. These plates may be made to embrace only two pipes, as shown at B, C, D, and E, or they may embrace three,

as at B C, or even a greater number, if.

desired. These minor details of construction and the manner of applying the plates to the pipes I do not deem as important, as they may be varied indefinitely within the skill of any good mechanic.

'hat I claim, and desire to secure'by Letters Patent, is

1. A heat-absorbing metal plate adapted to embrace and restupon two or more of the pipes of a cooling coil, substantially as and for the purpose hereinbefore set forth.

2. A heat-absorbing metal plate notched or slotted to fit upon two'or more of the pipes of a cooling-coil and having flanged saddles -which embrace the pipes, substantially as hereinbefore set forth.

3. A heat-absorbing metal plate notched or slotted to fit upon two or more of the pipes of a cooling-coil, with blocks or plugs which fill the notches and closely embrace the pipes, substantially as hereinbefore set forth.

In testimony whereof I hereto affix my signature in presence of two witnesses.

' ALLAN CAMPBELL. \Vitnesses:

CHAS. E. GORTON,

MARIE L. PRICE. 

